5538.96=4*3.14*r^2

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Solution for 5538.96=4*3.14*r^2 equation: 


Simplifying
5538.96 = 4 * 3.14r2

Multiply 4 * 3.14
5538.96 = 12.56r2

Solving
5538.96 = 12.56r2

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-12.56r2' to each side of the equation.
5538.96 + -12.56r2 = 12.56r2 + -12.56r2

Combine like terms: 12.56r2 + -12.56r2 = 0.00
5538.96 + -12.56r2 = 0.00

Add '-5538.96' to each side of the equation.
5538.96 + -5538.96 + -12.56r2 = 0.00 + -5538.96

Combine like terms: 5538.96 + -5538.96 = 0.00
0.00 + -12.56r2 = 0.00 + -5538.96
-12.56r2 = 0.00 + -5538.96

Combine like terms: 0.00 + -5538.96 = -5538.96
-12.56r2 = -5538.96

Divide each side by '-12.56'.
r2 = 441

Simplifying
r2 = 441

Take the square root of each side:
r = {-21, 21}

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